Inconsistent header for generated files with other k8s code generation tools

[SataQiu]

The header for other k8s code generation tools, such as defaulter-gen, deepcopy-gen and conversion-gen looks like:

// Code generated by xxx-gen. DO NOT EDIT.

But our header is different:

// autogenerated by xxx-gen object, do not modify manually

This may break something. For example, verify-boilerplate.sh in k/k uses DO NOT EDIT as a key word to identify automatically generated files. Ref: https://github.com/kubernetes/kubernetes/blob/master/hack/boilerplate/boilerplate.py#L211

So we'd better keep the header consistent with other code generation tools for a more consistent experience.

[SataQiu]

If this makes sense, please let me know. I'd love to send a PR.

[fejta-bot]

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[k8s-ci-robot]

@fejta-bot: Closing this issue.

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